Can't connect to pigpio at localhost(8888) Can't create callback thread. Perhaps too many simultaneous pigpio connections

Question

Have connected DHT11 to Rpi4.

VCC--pin 1

datapin--gpio4

Ground pin--pin 6

It works fine fine but after giving the result for few times then I get this error. New to pigpio please do help me figure out what's wrong

import time
from pigpio_dht import DHT11, DHT22
while True:
        gpio = 4 # BCM Numbering

        sensor = DHT11(gpio)
#sensor = DHT22(gpio)

        result = sensor.read()

        temperature=([value for value in result.values()][0])
        print(temperature)

        humidity=([value for value in result.values()][2])
        print(humidity)
        time.sleep(10)

Output:

28
46

28
46

28
46

28
46

28
46

and then I get the following:

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Can't connect to pigpio at localhost(8888)

Can't create callback thread.
Perhaps too many simultaneous pigpio connections.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Traceback (most recent call last):
  File "dht8.py", line 9, in <module>
    sensor = DHT11(gpio)
  File "/home/pi/.local/lib/python3.7/site-packages/pigpio_dht/dht11.py", line 24, in __init__
    super(DHT11, self).__init__(gpio, pi=pi, timeout_secs=timeout_secs, use_internal_pullup=True, max_read_rate_secs=1, datum_byte_count=1)
  File "/home/pi/.local/lib/python3.7/site-packages/pigpio_dht/dhtxx.py", line 47, in __init__
    self._pi.set_pull_up_down(gpio, pigpio.PUD_UP)
  File "/usr/lib/python3/dist-packages/pigpio.py", line 1385, in set_pull_up_down
    return _u2i(_pigpio_command(self.sl, _PI_CMD_PUD, gpio, pud))
  File "/usr/lib/python3/dist-packages/pigpio.py", line 993, in _pigpio_command
    sl.s.send(struct.pack('IIII', cmd, p1, p2, 0))
AttributeError: 'NoneType' object has no attribute 'send'

Thanks in advance

Answer 1

You are setting up device inside the while loop, so it creates multiple instances of same device, hence the error code

Can't create callback thread.
Perhaps too many simultaneous pigpio connections.

You need to create one device instance and read the info from sensor chronically. Something like this would work:

import time
from pigpio_dht import DHT11, DHT22

gpio = 4 # BCM Numbering

sensor = DHT11(gpio)
   
while True:
       
        result = sensor.read()

        temperature=([value for value in result.values()][0])
        print(temperature)

        humidity=([value for value in result.values()][2])
        print(humidity)
        time.sleep(10)